A piston is a cylindrical piece of metal that moves up and down inside each cylinder, compressing the air-fuel mixture and capturing the force created by the combustion process. This force is then transferred to the crankshaft, via the connecting rod.

Symptoms of a Bad or Failing Piston

  • Engine misfire
  • Excessive oil consumption
  • Knocking or slapping noise from inside engine

Piston Related Repair Advice

  • A failed piston can cause internal engine damage; the engine might need to be replaced
  • A "short block" replacement may also be recommended—this replacement only includes the lower parts of the engine and leaves out the cylinder head and intake manifold

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